35kV-level distributed power supply circuit

Abstract

The utility model discloses a 35kV-level distributed power supply circuit, which relates to the technical field of power supply, aims to solve the problem of large line loss of a power supply circuit, and comprises a main power distribution module provided with a first power supply unit and a second power supply unit which are connected with each other. The main power distribution module is connected with an emergency power distribution module, the main power distribution module and the emergency power distribution module are connected with a plurality of power distribution modules, the main power distribution module inputs 35KV voltage, and the power distribution modules output 400V voltage, so that line loss can be reduced, energy consumption can be reduced, power supply efficiency can be improved, cable investment can be reduced, and cost can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of power supply technology, specifically relating to a 35kV distributed power supply circuit. Background Technology

[0002] With the development of the internet, cloud computing, and intelligent computing, the power consumption of a single data center rack is increasing, leading to a surge in power demand for the entire data center and its campus. Currently, for medium to large-sized data center campuses, a "2+1" model is common, consisting of two data center buildings and one power center. The power capacity of a single data center building can reach approximately 20MW. Traditional 10kV single-circuit 10MW capacity is no longer sufficient to meet the campus's power needs. Therefore, 35kV and above substations are required to provide greater power capacity to meet the data center campus's requirements. Traditional power supply module solutions typically employ a two-stage step-down mode: stepping down from 35kV and above substations to 10kV, and then further stepping down from 10kV to 0.4kV before powering the final load equipment. This results in numerous intermediate power supply stages, a large number of devices, and significant energy losses, leading to low overall energy efficiency and high investment costs. Furthermore, traditional models generally use diesel generator sets as emergency backup power, increasing equipment investment, complicating maintenance, and causing adverse environmental impacts due to the large amounts of exhaust fumes emitted by diesel generators.

[0003] For example, Chinese patent CN111600329B discloses a distributed photovoltaic power station system and a power compensation method. The system includes an internal power grid and one or more photovoltaic power generation systems. The internal power grid includes an internal power grid bus and multiple power supply lines. Each power supply line is connected to the internal power grid bus via a distribution transformer. Each power supply line is equipped with a reactive power detection device. Each photovoltaic power generation system is connected to the corresponding power supply line between the distribution transformer and the reactive power detection device. The power supply end of each power supply line is connected to the plant's load and a reactive power compensation device. The invention also discloses a compensation method, including power compensation for each power supply line and power compensation for the photovoltaic power station system. Power compensation for each power supply line includes: S01, detecting real-time active and reactive power data on the corresponding power supply line; S02, performing reactive power compensation based on the real-time active and reactive power data. The system and method of the present invention have the advantages of reliable operation and adjustable power factor. However, the Chinese patent with publication number CN111600329B requires two-stage voltage reduction to obtain the required 400V voltage from 35kV voltage in order to meet the power supply range requirements. This results in low power supply efficiency and large line loss. Utility Model Content

[0004] To address the problem of high line losses in power supply circuits, this invention proposes a 35kV distributed power supply circuit that can reduce line losses, reduce energy consumption, improve power supply efficiency, and thus reduce cable investment and lower costs.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a 35kV distributed power supply circuit.

[0006] It includes a main power distribution module with a first power supply unit and a second power supply unit, the first power supply unit and the second power supply unit are connected, the main power distribution module is connected to an emergency power distribution module, the main power distribution module and the emergency power distribution module are connected to a plurality of distribution modules, the main power distribution module inputs 35KV voltage, and the distribution modules output 400V voltage.

[0007] This technical solution requires only one stage of voltage reduction, which increases power supply capacity while reducing energy consumption, line loss, cost, cable investment, and power supply efficiency.

[0008] Preferably, the first power supply unit includes a first busbar, the second power supply unit includes a second busbar, the first busbar and the second busbar are respectively connected to four incoming lines, and each incoming line is provided with an incoming line switch.

[0009] Preferably, the first busbar is connected to a 35kV first mains power supply, which supplies power to the first busbar, and the second busbar is connected to a 35kV second mains power supply, which supplies power to the second busbar.

[0010] Preferably, a first mains power supply cable inlet is provided with a first mains power supply inlet switch, and a second mains power supply cable inlet is provided with a second mains power supply inlet switch.

[0011] Preferably, each of the power distribution modules includes two 35kV / 0.4kV step-down transformers and two incoming lines, with a bus tie switch between the two incoming lines.

[0012] Preferably, the emergency power distribution module includes a 35kV third mains power supply, the third mains power supply is connected to a third cable inlet, the third cable inlet is equipped with a backup power inlet switch, the backup power inlet switch is connected to a backup bus, and the third mains power supply supplies power to the backup bus.

[0013] Preferably, the emergency power distribution module includes two outgoing lines, which are respectively connected to the incoming line switch of one incoming line of the first power unit and the incoming line switch of one incoming line of the second power unit.

[0014] Preferably, a tie switch is provided between the first busbar and the second busbar.

[0015] Preferably, an electrical interlock is provided between the two incoming lines and the bus tie switch.

[0016] Preferably, the emergency power distribution module includes a backup power supply switch, and the backup power supply switch and the mains power supply switch are electrically interlocked.

[0017] The beneficial effects of this utility model are:

[0018] 1) Only one level of voltage reduction is required, which can increase power supply capacity while reducing energy consumption, reducing line loss, reducing costs, reducing cable investment, and improving power supply efficiency.

[0019] 2) The third mains power supply is used as an emergency backup power module to reduce the investment in diesel generator units and the workload of routine operation and maintenance. Attached Figure Description

[0020] Figure 1 This is the first part of the first power supply unit in the primary wiring diagram of this utility model.

[0021] Figure 2 This is the second part of the first power supply unit in the primary wiring diagram of this utility model.

[0022] Figure 3 This utility model relates to an emergency power distribution module with a primary wiring diagram.

[0023] Figure 4 This is the first part of the second power supply unit in the primary wiring diagram of this utility model.

[0024] Figure 5 This is the second part of the second power supply unit in the primary wiring diagram of this utility model.

[0025] Figure 6 This is the power distribution module of the primary wiring diagram of this utility model.

[0026] Figure 7 This is a block diagram of a 35kV distributed power supply circuit according to this utility model. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only one preferred embodiment of this utility model and are only used to explain this utility model. They do not limit the scope of protection of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] Example 1

[0029] This embodiment provides a 35kV distributed power supply circuit capable of supplying power to a data center campus, such as... Figure 2 As shown, it includes a main power distribution module, a distribution module, and an emergency power distribution module. It can obtain 400V voltage from 35kV mains power through only one-stage step-down, which can reduce the energy consumption of the power supply module, improve energy efficiency, and reduce costs.

[0030] The park is planned to have two data center buildings, with a total power capacity of 34MVA. Since the single-circuit 10MVA capacity of the 10kV voltage level is no longer sufficient to meet the power demand of the park, a 35kV voltage substation is needed to provide a larger power supply capacity to meet the needs of the data center park.

[0031] The required voltage for the park is 380V or 220V. Traditional power supply module solutions typically require a two-stage step-down mode, that is, stepping down from a 35kV substation to 10kV, and then stepping down from 10kV to 0.4kV before powering the final load equipment. However, the two-stage step-down mode involves many intermediate power supply stages, resulting in more equipment, greater power loss, low overall energy efficiency, and high cost. Therefore, this embodiment proposes a 35kV-level distributed power supply circuit that only requires a single-stage step-down to improve energy efficiency.

[0032] In this embodiment, a 35kV distributed power supply circuit is powered by a main power distribution module, which is located in a 35kV main power distribution station. The main power distribution station is located in the data center completed in Phase 1.

[0033] In this embodiment, a separate 35kV substation is not set up within the park; the Phase 2 data center draws power from the 35kV main substation of the Phase 1 data center.

[0034] In this embodiment, the entire park is supplied with two mains power lines, forming a 2N power supply mode as the main power source. In addition, the backup power distribution module uses a diesel generator set as an emergency backup power source.

[0035] The 35kV main distribution station is divided into main station A room, main station B room and main station C room, with main station A room and main station B room respectively housing the main 35kV power distribution module.

[0036] The main wiring structure of the main power distribution module adopts a 4-inlet and 1-bus tie structure, including main mains power inlet switches S1 and S2, emergency power inlet switches S3 and S4, and bus tie switch S5.

[0037] Specifically, the main power distribution module includes a first power supply unit and a second power supply unit, which are located in Room A and Room B, respectively. The two power supply units supply power to the Phase 1 data center and the Phase 2 data center, respectively.

[0038] like Figures 1-6 As shown, the first part and the second part of the first power supply unit are connected via C+ and C-, the first part and the second part of the second power supply unit are connected via F+ and F-, the first power supply unit and the second power supply unit are connected via B+ and B-, the emergency power distribution module is connected to the first power supply unit via A1+ and A1-, the emergency power distribution module is connected to the second power supply unit via A2+ and A2-, the power distribution module is connected to the first power supply module via D1+ and D2+, and the power distribution module is connected to the second power supply module via E1+ and E2+, and the power distribution module is connected to the second power supply module via E1- and E2-.

[0039] Both power supply units include a 35kV cable input line, namely the first cable input line and the second cable input line. The first cable input line of the first power supply unit is connected to the first mains power supply, and the second cable input line of the second power supply unit is connected to the second mains power supply. Both cable input lines are equipped with cable input switches.

[0040] The main power distribution module supplies power to the transformers of each floor substation via radial cable lines.

[0041] The operation mode of the 35kV main distribution module will be described in detail below.

[0042] The main power distribution module adopts a segmented single busbar wiring form. The first power supply unit and the second power supply unit are equipped with one busbar, namely the first busbar and the second busbar. The two ends of the busbar are respectively connected to the corresponding cable inlet switches, and a tie switch is set between the two busbars.

[0043] During normal operation, two 35kV mains power supplies supply power to the two bus sections respectively. The two power supplies work simultaneously and serve as backups for each other. The tie switch is disconnected during operation.

[0044] When one of the 35kV mains power supplies fails, the tie switch is activated, and the other power supply supplies power to both bus sections. Each power supply can carry the entire load.

[0045] After the mains power supply on the affected side is restored, the system returns to a dual-circuit mains power supply state.

[0046] In this embodiment, the bus tie is equipped with an automatic transfer switch, which can be manually deactivated. In automatic mode, when the first power supply fails, the bus tie switch automatically engages after a delay. When the power supply is restored, the automatic transfer switch can be manually deactivated; it does not automatically reset. Each power supply can provide 100% power supply capacity.

[0047] Room C houses the main 35kV emergency power distribution module. The main wiring structure adopts a 1-in-2-out configuration, with module 2 connected to the S3 and S4 incoming switches of the main 35kV power distribution module.

[0048] The operation mode of the backup power distribution module will be described in detail below.

[0049] When a power failure is detected in both the mains power supply and the upper port of the backup power supply incoming switch is energized, disconnect the power failure mains power supply incoming switch and the tie switch, and close the backup power supply incoming switch. The power failure bus will then be powered by the backup power supply.

[0050] After the mains power is restored, the system will return to mains power supply.

[0051] This embodiment of a 35kV distributed power supply circuit is equipped with an automatic switching device, which can achieve the required function. Specifically, the automatic switching device can be a PLC or a microcomputer integrated relay protection device.

[0052] In this embodiment, multiple switches of a 35kV distributed power supply circuit are equipped with electrical interlocks, and it is strictly prohibited to connect any two power sources in a loop or operate them in parallel with the grid.

[0053] Specifically, electrical interlocks are provided between the two incoming lines and the bus tie switch, and electrical interlocks are provided between the backup power incoming line switch and the mains power incoming line switch of the emergency power distribution module to ensure that they are not closed at the same time.

[0054] Any isolating handcart and its corresponding switch are electrically interlocked to restrict the operating sequence of the isolating handcart and the switch.

[0055] The transformer door and the circuit breaker at the transformer's front end are interlocked. The circuit breaker can only be closed after the transformer door is closed, and the transformer door can only be opened after the circuit breaker is opened. The transformer is equipped with an audible and visual alarm device for opening the door. The interlock can be manually released.

[0056] In the transformer front-end main power and backup power switching module, the main power incoming switch and the backup power incoming switch are electrically interlocked to ensure that they are not closed at the same time.

[0057] In this embodiment, an integrated relay protection module is used to control the switching status of each switch.

[0058] The following provides a detailed explanation of the correspondence between power supply status and switch status.

[0059] When both mains power supplies are operating normally, simultaneously close the first power supply incoming switch and the second power supply incoming switch, and disconnect the two backup power supply incoming switches and the connecting switch of the two busbars.

[0060] When the first mains power supply fails, the first power supply incoming switch, which is normally closed, is opened, the second power supply incoming switch remains closed, and the bus tie switch is closed.

[0061] When the second mains power supply fails, the second power supply incoming switch, which is normally closed, is opened, while the first power supply incoming switch remains closed, and the bus tie switch is closed.

[0062] When both the first and second mains power supplies fail, the first and second power supply incoming switches, which are normally closed, are both opened, the bus tie switch remains open, and the two backup power supply incoming switches are closed.

[0063] This utility model discloses a 35kV distributed power supply circuit, which mainly adopts a single-stage step-down distributed architecture. 35 kV / 0.4kV step-down transformer substations are installed on each floor of the data center according to load planning requirements.

[0064] According to current conventional engineering practices, the step-down transformers used are dry-type transformers with a capacity controlled within 2500kVA.

[0065] The power distribution module is placed in the 35kV / 0.4kV step-down power distribution station. The power distribution station includes Substation I and Substation II. Substation I and Substation II respectively house the 35kV / 0.4kV step-down power distribution station section I module and the power distribution station section II module, namely the first power distribution module and the second power distribution module.

[0066] The main wiring structure of the power distribution module adopts a 2-inlet and 1-bus tie structure, with main mains power inlet switches K1 and K2, and bus tie switch K3.

[0067] The power distribution module adopts a segmented single busbar wiring form, with a bus tie switch installed between the two busbar segments.

[0068] The operation mode of the power distribution module will be explained in detail below.

[0069] During normal operation, the two transformers in the same group work simultaneously, and the two 0.4kV mains power supplies supply power to the two bus sections respectively, and the bus tie switch operates in sections.

[0070] When one of the transformers fails or is under maintenance, one 0.4kV power supply line is de-energized. The low-voltage incoming line switch on the faulty or under-maintenance side is disconnected, and the bus tie switch is closed. The load of that transformer is then powered by the other transformer, meaning that another 0.4kV power supply line supplies power to both bus sections. Each power supply line can support the entire load. Electrical interlocking is installed between the two incoming line switches and the bus tie switch in the same group, ensuring that only two switches can be in the closed state at any time.

[0071] After the 0.4kV power supply on the power outage side is restored, the system returns to dual-circuit mains power supply.

[0072] Example 2

[0073] This embodiment provides a 35kV distributed power supply circuit capable of supplying power to a data center campus. It includes a main power distribution module, a distribution module, and an emergency power distribution module. It achieves 400V voltage from 35kV mains power through only one-stage step-down, which can reduce the energy consumption of the power supply module, improve energy efficiency, and reduce costs.

[0074] The park is planned to have two data center buildings, with a total power capacity of 34MVA. Since the single-circuit 10MVA capacity of the 10kV voltage level is no longer sufficient to meet the power demand of the park, a 35kV voltage substation is needed to provide a larger power supply capacity to meet the needs of the data center park.

[0075] The required voltage for the park is 380V or 220V. Traditional power supply module solutions typically require a two-stage step-down mode, that is, stepping down from a 35kV substation to 10kV, and then stepping down from 10kV to 0.4kV before powering the final load equipment. However, the two-stage step-down mode involves many intermediate power supply stages, resulting in more equipment, greater power loss, low overall energy efficiency, and high cost. Therefore, this embodiment proposes a 35kV-level distributed power supply circuit that only requires a single-stage step-down to improve energy efficiency.

[0076] In this embodiment, a 35kV distributed power supply circuit is powered by a main power distribution module, which is located in a 35kV main power distribution station. The main power distribution station is located in the data center completed in Phase 1.

[0077] In this embodiment, a separate 35kV substation is not set up within the park; the Phase 2 data center draws power from the 35kV main substation of the Phase 1 data center.

[0078] Unlike Embodiment 1, in this embodiment, the entire park is supplied with three mains power lines. Two of these mains power lines form a 2N power supply mode and serve as the primary power source. The third mains power line is independent of the first and second mains power lines and serves as an emergency backup power source.

[0079] In the event of a power outage in a data center, without a reliable backup power supply module, the services supported by many critical devices will be interrupted, causing incalculable losses to the data center. Therefore, backup power is crucial for the power supply module of a data center. However, using diesel generator sets as emergency backup power not only requires increased investment in equipment but also increases the complexity of maintenance work. In addition, the large amount of exhaust gas emitted by diesel generators during operation will also have an adverse impact on the surrounding environment.

[0080] In this embodiment, the emergency backup power supply uses the third line of mains power, eliminating the need for a separate diesel generator module as an emergency backup power source. This avoids the problems of high investment, high maintenance costs, and environmental unfriendliness associated with using a diesel generator as an emergency backup power source.

[0081] The 35kV main distribution station is divided into main station A room, main station B room and main station C room, with main station A room and main station B room respectively housing the main 35kV power distribution module.

[0082] The main wiring structure of the main power distribution module adopts a 4-inlet and 1-bus tie structure, including main mains power inlet switches S1 and S2, emergency power inlet switches S3 and S4, and bus tie switch S5.

[0083] Specifically, the main power distribution module includes a first power supply unit and a second power supply unit, which are located in Room A and Room B, respectively. The two power supply units supply power to the Phase 1 data center and the Phase 2 data center, respectively.

[0084] like Figures 1-6 As shown, the first part and the second part of the first power supply unit are connected via C+ and C-, the first part and the second part of the second power supply unit are connected via F+ and F-, the first power supply unit and the second power supply unit are connected via B+ and B-, the emergency power distribution module is connected to the first power supply unit via A1+ and A1-, the emergency power distribution module is connected to the second power supply unit via A2+ and A2-, the power distribution module is connected to the first power supply module via D1+ and D2+, and the power distribution module is connected to the second power supply module via E1+ and E2+, and the power distribution module is connected to the second power supply module via E1- and E2-.

[0085] Both power supply units include a 35kV cable input line, namely the first cable input line and the second cable input line. The first cable input line of the first power supply unit is connected to the first mains power supply, and the second cable input line of the second power supply unit is connected to the second mains power supply. Both cable input lines are equipped with cable input switches.

[0086] The main power distribution module supplies power to the transformers of each floor substation via radial cable lines.

[0087] The operation mode of the 35kV main distribution module will be described in detail below.

[0088] The main power distribution module adopts a segmented single busbar wiring form. The first power supply unit and the second power supply unit are equipped with one busbar, namely the first busbar and the second busbar. The two ends of the busbar are respectively connected to the corresponding cable inlet switches, and a tie switch is set between the two busbars.

[0089] During normal operation, two 35kV mains power supplies supply power to the two bus sections respectively. The two power supplies work simultaneously and serve as backups for each other. The tie switch is disconnected during operation.

[0090] When one of the 35kV mains power supplies fails, the tie switch is activated, and the other power supply supplies power to both bus sections. Each power supply can carry the entire load.

[0091] After the mains power supply on the affected side is restored, the system returns to a dual-circuit mains power supply state.

[0092] In this embodiment, the bus tie is equipped with an automatic transfer switch, which can be manually deactivated. In automatic mode, when the first power supply fails, the bus tie switch automatically engages after a delay. When the power supply is restored, the automatic transfer switch can be manually deactivated; it does not automatically reset. Each power supply can provide 100% power supply capacity.

[0093] Room C houses the main 35kV emergency power distribution module. The main wiring structure adopts a 1-in-2-out configuration, with module 2 connected to the S3 and S4 incoming switches of the main 35kV power distribution module.

[0094] The operation mode of the backup power distribution module will be described in detail below.

[0095] When a power failure is detected in both the mains power supply and the upper port of the backup power supply incoming switch is energized, disconnect the power failure mains power supply incoming switch and the tie switch, and close the backup power supply incoming switch. The power failure bus will then be powered by the backup power supply.

[0096] After the mains power is restored, the system will return to mains power supply.

[0097] This embodiment of a 35kV distributed power supply circuit is equipped with an automatic switching device, which can achieve the required function. Specifically, the automatic switching device can be a PLC or a microcomputer integrated relay protection device.

[0098] In this embodiment, multiple switches of a 35kV distributed power supply circuit are equipped with electrical interlocks, and it is strictly prohibited to connect any two power sources in a loop or operate them in parallel with the grid.

[0099] Specifically, electrical interlocks are provided between the two incoming lines and the bus tie switch, and electrical interlocks are provided between the backup power incoming line switch and the mains power incoming line switch of the emergency power distribution module to ensure that they are not closed at the same time.

[0100] Any isolating handcart and its corresponding switch are electrically interlocked to restrict the operating sequence of the isolating handcart and the switch.

[0101] The transformer door and the circuit breaker at the transformer's front end are interlocked. The circuit breaker can only be closed after the transformer door is closed, and the transformer door can only be opened after the circuit breaker is opened. The transformer is equipped with an audible and visual alarm device for opening the door. The interlock can be manually released.

[0102] In the transformer front-end main power and backup power switching module, the main power incoming switch and the backup power incoming switch are electrically interlocked to ensure that they are not closed at the same time.

[0103] In this embodiment, an integrated relay protection module is used to control the switching status of each switch.

[0104] The following provides a detailed explanation of the correspondence between power supply status and switch status.

[0105] When both mains power supplies are operating normally, simultaneously close the first power supply incoming switch and the second power supply incoming switch, and disconnect the two backup power supply incoming switches and the connecting switch of the two busbars.

[0106] When the first mains power supply fails, the first power supply incoming switch, which is normally closed, is opened, the second power supply incoming switch remains closed, and the bus tie switch is closed.

[0107] When the second mains power supply fails, the second power supply incoming switch, which is normally closed, is opened, while the first power supply incoming switch remains closed, and the bus tie switch is closed.

[0108] When both the first and second mains power supplies fail, the first and second power supply incoming switches, which are normally closed, are both opened, the bus tie switch remains open, and the two backup power supply incoming switches are closed.

[0109] This utility model discloses a 35kV distributed power supply circuit, which mainly adopts a single-stage step-down distributed architecture. 35 kV / 0.4kV step-down transformer substations are installed on each floor of the data center according to load planning requirements.

[0110] According to current conventional engineering practices, the step-down transformers used are dry-type transformers with a capacity controlled within 2500kVA.

[0111] The power distribution module is placed in the 35kV / 0.4kV step-down power distribution station. The power distribution station includes Substation I and Substation II. Substation I and Substation II respectively house the 35kV / 0.4kV step-down power distribution station section I module and the power distribution station section II module, namely the first power distribution module and the second power distribution module.

[0112] The main wiring structure of the power distribution module adopts a 2-inlet and 1-bus tie structure, with main mains power inlet switches K1 and K2, and bus tie switch K3.

[0113] The power distribution module adopts a segmented single busbar wiring form, with a bus tie switch installed between the two busbar segments.

[0114] The operation mode of the power distribution module will be explained in detail below.

[0115] During normal operation, the two transformers in the same group work simultaneously, and the two 0.4kV mains power supplies supply power to the two bus sections respectively, and the bus tie switch operates in sections.

[0116] When one of the transformers fails or is under maintenance, one 0.4kV power supply line is de-energized. The low-voltage incoming line switch on the faulty or under-maintenance side is disconnected, and the bus tie switch is closed. The load of that transformer is then powered by the other transformer, meaning that another 0.4kV power supply line supplies power to both bus sections. Each power supply line can support the entire load. Electrical interlocking is installed between the two incoming line switches and the bus tie switch in the same group, ensuring that only two switches can be in the closed state at any time.

[0117] After the 0.4kV power supply on the power outage side is restored, the system returns to dual-circuit mains power supply.

Claims

1. A 35kV distributed power supply circuit, characterized in that, It includes a main power distribution module with a first power supply unit and a second power supply unit, the first power supply unit and the second power supply unit are connected, the main power distribution module is connected to an emergency power distribution module, the main power distribution module and the emergency power distribution module are connected to a plurality of distribution modules, the main power distribution module inputs 35KV voltage, and the distribution modules output 400V voltage.

2. The 35kV distributed power supply circuit according to claim 1, characterized in that, The first power supply unit includes a first busbar, and the second power supply unit includes a second busbar. The first busbar is connected to a first cable inlet, and the second busbar is connected to a second cable inlet.

3. A 35kV distributed power supply circuit according to claim 2, characterized in that, The first cable inlet is connected to a 35kV first mains power supply, which supplies power to the first busbar. The second cable inlet is connected to a 35kV second mains power supply, which supplies power to the second busbar.

4. A 35kV distributed power supply circuit according to claim 3, characterized in that, A first AC power inlet switch is provided on the first cable inlet of the first AC power source, and a second AC power inlet switch is provided on the second cable inlet of the second AC power source.

5. A 35kV distributed power supply circuit according to claim 1, characterized in that, Each of the aforementioned power distribution modules includes two 35kV / 0.4kV step-down transformers and two incoming lines, with a bus tie switch installed between the two incoming lines.

6. A 35kV distributed power supply circuit according to any one of claims 1-5, characterized in that, The emergency power distribution module includes a 35kV third mains power supply, which is connected to a third cable inlet. A backup power inlet switch is provided on the third cable inlet, and the backup power inlet switch is connected to a standby busbar. The third mains power supply supplies power to the standby busbar.

7. A 35kV distributed power supply circuit according to claim 2, characterized in that, The emergency power distribution module includes two outgoing lines, which are respectively connected to the incoming line switch of one incoming line of the first power unit and the incoming line switch of one incoming line of the second power unit.

8. A 35kV distributed power supply circuit according to claim 2, characterized in that, A tie switch is provided between the first busbar and the second busbar.

9. A 35kV distributed power supply circuit according to claim 5, characterized in that, Electrical interlocking is provided between the two incoming lines and the bus tie switch.

10. A 35kV distributed power supply circuit according to claim 4, characterized in that, The emergency power distribution module includes a backup power supply switch, and an electrical interlock is provided between the backup power supply switch and the mains power supply switch.

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